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[TowerTalk] Common-mode current on feedline

To: <towertalk@contesting.com>
Subject: [TowerTalk] Common-mode current on feedline
From: olinger@bellsouth.net (Guy Olinger, K2AV)
Date: Thu Jun 26 12:23:10 2003
Personally, in my private cogitation space, where I don't have to prove 
anything to anybody, I've gotten a good bit disbelieving of the various mental 
simplifications of ground.

Not at all convinced any more that the ground underneath a coax shield laying 
above necessarily does anything to the current on the shield if connected. 

For all I know, the capacity of the shield to the ground on one side of a 
blocking device, and reverse on the other side, allows the rf to "walk around" 
the block. 

That's much the same as driving on the shoulder to get around a wreck blocking 
the pavement. I get slowed down, but I still get where I was going.

73, Guy.

> 
> From: Chuck Counselman <ccc@space.mit.edu>
To: <towertalk@contesting.com>
> Date: 2003/06/26 Thu AM 11:38:14 EDT
> To: towertalk@contesting.com
> Subject: Re: [TowerTalk] Common-mode current on feedline
> 
> At 9:58 AM -0400 6/26/03, Guy Olinger, K2AV wrote:
> >...the "choking" ability of various devices seems to be overstated...
> 
> I agree.
> 
> 
> >and there is little around about measurements in actual field situations.
> 
> I've found _no_ measurements of actual field situations.  That's why 
> I asked whether anyone could point me to anything.  So far, nothing.
> 
> 73 de Chuck, W1HIS
> 
> 
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> 
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> 
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